CN101811144A - Laminar flow water cooling device and control method - Google Patents
Laminar flow water cooling device and control method Download PDFInfo
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- CN101811144A CN101811144A CN200910046534A CN200910046534A CN101811144A CN 101811144 A CN101811144 A CN 101811144A CN 200910046534 A CN200910046534 A CN 200910046534A CN 200910046534 A CN200910046534 A CN 200910046534A CN 101811144 A CN101811144 A CN 101811144A
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Abstract
The invention relates to a laminar flow water cooling device and a control method. The laminar flow water cooling device comprises a plurality of water storage pipes, the arrangement direction of the water storage pipes is the same as the operating direction of strip steel, the water storage pipes are symmetrically distributed, water inlet ends of the water storage pipes are respectively provided with a water valve, and bodies of the water storage pipes are respectively provided with a plurality of cooling water pipes distributed at equal intervals. The control method comprises the following steps of: (1) starting; (2) acquiring width data of the strip steel from an upper PLC; (3) calculating the width of cooling water; (4) using a control unit to send opening command to all the water valves; (5) using an electromagnetic valve to control the water valves according to the opening command; (6) judging whether the strip steel throws the tail; (7) leading the laminar flow water cooling device to stop working; and (8) finishing laminar flow cooling control process. The invention adjusts the area of the cooling water along the channel width direction according to the cooling technique requirements of different widths of the strip steel, reduces the temperature reduction at the side of the strip steel, and guarantees the profile shape, the mechanical performance, the temperature and the uniformity of phase change along the width direction of the strip steel.
Description
Technical field
The present invention relates to a kind of hot-rolling laminar cooling technology of field of metallurgy, relate in particular to the method for a kind of hot-rolling laminar cooling device and cooling control.
Background technology
The hot rolling tandem mill production line of iron and steel enterprise all will use cooling facility for laminar flow, and its major function is exactly the band steel with the finish rolling outlet, cools off fast according to the target temperature that batches setting, to guarantee the properties of product of band steel.
With the hot rolling mill is example, and its cooling facility for laminar flow has 76 groups of cooling manifolds (correspondence is a group up and down).Wherein preceding 68 groups is main cold section, and the back is a fine cold-leg for 8 groups.Generally be divided into several cooling zones, each cooling zone all has cold section cooling zone serial connection with fine cold-leg of master separately to form, and the master of cooling zone is made of some groups strong cold collector groups and the some groups of cold collector groups of master again for cold section.The cold model of layer calculate required when opening collector valve group, according to main cold section from front to back, fine cold-leg rule is from back to front set.Therefore,, all need open in each setting, therefore be in normally open basically for back 4 groups of main cold section preceding 4 groups and fine cold-leg to the setting temperature drop of coiling temperature according to finishing temperature; All there are data the position of every group of collector (apart from the last frame of finish rolling) in basic automatization control, basic automatization all needs to follow the tracks of for the position of band steel on the laminar flow roller-way in addition.Its cooling control is as follows:
At first, the process machine calculates by the cold model of layer according to finishing temperature and the coiling temperature set, and that determines main cold section and fine cold-leg cooling manifold opens the group number, and under send instructions and water valve controlled to the finish rolling basic automatization.
Secondly, after the band steel goes out the last frame of finish rolling temperature measurer measures the finishing temperature of band steel reality after by finish rolling, again the group number of opening of cooling manifold is regulated accordingly.
At last, after the batching temperature measurer and measure the actual coiling temperature of band steel after layer is cold, dynamically the laminar flow cooling manifold is opened the group number and regulates according to the desired value of setting of batching, with the coiling temperature that guarantees the band steel in setting range.It is 5 degree that the cooling water inflow of each valve group can be controlled belt steel temperature.
Hot Strip shape is the quality problems of users' special concern always, the good and bad use that directly influences product of strip shape quality, especially in recent years along with the fast development of steel and iron industry, the belt steel product application is constantly expanded, and the user also improves day by day to the requirement of its strip shape quality.
Hot rolling line constantly develops, and production kind, specification enlarge gradually, and present product structure in the past based on straight carbon steel, is mainly produced micro alloyed steel and carbon manganese steel with completely different in the past at present.Existing laminar cooling system, continuous expansion and user's improving constantly along with the rolling line rolling specs to the product quality requirement, can not satisfy the needs that the part steel grade is produced, more especially contain the strength steel (as: BS600, BS700, B510L, S45C, SS400 etc.) of alloying element.These strength steel are after process laminar flow cooled region, because existing laminar cooling system exists the hydraulic pressure shakiness, problems such as current skewness cause the inhomogeneous cooling of band steel, thereby cause being with steel a series of strip shape quality problems to occur, in the rolling line production process, find the band steel easily because the C that inhomogeneous cooling causes sticks up, the plate deformationization that causes with the width inhomogeneous cooling, especially the reduction of limit portion temperature produces the internal stress of bringing bilateral unrestrained trend than conference in follow-up cooling procedure, gives the plate shape of band steel, mechanical performance, temperature and phase transformation all can bring very big influence in the uniformity of width.
For this reason, Kawasaki Steel Corp. applies for a patent " cooling means of sheet metal strip and device " (open day 1987.12.16 of application in China, patent publication No. CN87100594), its cooling facility for laminar flow adopts the laminar flow jet pipe of being made up of the flat board member of a pair of qualification slit, cooling water flows through this slit and forms a cooling water screen, for regulating the passage area in this jet pipe, the flat board member of this laminar flow jet pipe has at least one can be out of shape on perpendicular to the direction of flow of cooling water, have at least a flat board to respond cooling water pressure preferably, cause that passage area changes, thereby regulate the cooling-water duct zone.The method adopts the method to laminar flow cooling manifold edge-masking, strip edge portion temperature is reduced big problem a solution is provided, but also there is weak point in this method, obviously, the shortcoming of this prior art is: when producing than ribbon steel, a large amount of cooling waters waste, and are unfavorable for the saving of the resources of production.
The inventor imagines a kind of cooling facility for laminar flow of development and cooling means, can be according to the process for cooling requirement of band steel different in width, the corresponding slit laminar flow of setting up corresponding to the band channel width, realize the respective change of laminar flow cooled region on width, thereby regulate the zone of cooling water on channel width direction, reduce the temperature drop of strip edge portion, guarantee with plate shape, mechanical performance, temperature and the phase transformation of steel uniformity at width; Different with existing edge-masking technology, when reaching effect same, can also avoid the waste of cooling water resources, through online information retrieval, not seeing up to now has same or analogous patented technology.
Summary of the invention
Exist the strip width direction at the existing layer flow cooling system and cool off phenomenon pockety, the object of the present invention is to provide a kind of laminar flow water cooling device and control method, can be according to the process for cooling requirement of band steel different in width, the corresponding slit laminar flow of setting up corresponding to the band channel width, realize the respective change of laminar flow cooled region on width, thereby regulate the zone of cooling water on channel width direction, reduce the temperature drop of strip edge portion, guarantee with plate shape, mechanical performance, temperature and the phase transformation of steel uniformity at width.
In order to achieve the above object, a kind of laminar flow water cooling device of the present invention comprises some standpipes, the setting of described standpipe is consistent with band steel traffic direction, described standpipe is symmetrically distributed, and the standpipe water inlet end respectively is provided with a water valve, and each standpipe is provided with some cooling water pipes on one's body.
Preferably, the standpipe of described each group symmetrical distribution is controlled by same water valve.
Preferably, described cooling water pipe is some groups of goosenecks, and gooseneck spiral respectively is connected on the standpipe, and the outlet of gooseneck is equidistant respectively to be arranged in and with on the perpendicular straight line of steel traffic direction.
Preferably, the outlet of preceding half group of gooseneck of described every group of gooseneck is distributed in a side of standpipe, and the outlet of later half group of gooseneck is distributed in the opposite side of standpipe.
Preferably, the outlet of described every group of gooseneck is symmetrically distributed according to the center of every group of gooseneck.
Preferably, a control module connects each water valve respectively, sends the valve opening and closing signal to each water valve.
Preferably, described standpipe non-uniform Distribution, the distance between the described limit portion standpipe is little than the distance between the standpipe of middle part.
Preferably, described standpipe equidistantly distributes.
A kind of control method of laminar flow water cooling device, in may further comprise the steps:
Step 1, beginning: adjust described water valve openings of sizes, and confirm that water valve is in the automatic control state of magnetic valve;
Step 2, obtain the strip width data: directly obtain the strip width data from upper PLC, and confirm from upper PLC;
Step 3, calculating cooling water width:, calculate required cooling water width, cooling water width B=H-Δ X according to band steel kind and specification, wherein, H is the strip width data, and Δ X is a cooling water width adjustment value, this Δ X cooling water width adjustment value be an experience on the occasion of;
Step 4, described control module send open command to each water valve: described control module sends open command to the magnetic valve of controlling each water valve according to cooling water opens wide result of calculation;
Step 7, new width or the end laminar flow of data decision adjustment that is provided by upper PLC cool off control procedure.
Preferably, between step 5 and step 6, also comprise step 5-1: judge whether whipping of band steel:
Cooling facility for laminar flow in the course of the work, to the band steel whether whipping is followed the tracks of, the decision whether stop control:
If the band steel is whipping, then be with the cooling of steel laminar flow to finish execution in step six;
If the band steel is whipping not, then work on until whipping.
The present invention makes it compared with prior art owing to adopted above technical scheme, has the following advantages and good effect:
The present invention is by the application of a kind of cooling facility for laminar flow and cooling means, can be according to the process for cooling requirement of band steel different in width, the corresponding slit laminar flow of setting up corresponding to the band channel width, realize the respective change of laminar flow cooled region on width, thereby regulate the zone of cooling water on channel width direction, reduce the temperature drop of strip edge portion, guarantee with plate shape, mechanical performance, temperature and the phase transformation of steel uniformity at width; In addition, the technology of the present invention is different with existing edge-masking technology, when reaching effect same, can avoid the waste of cooling water resources.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.
In the accompanying drawings:
Fig. 1 is a laminar cooling water pipe distribution schematic diagram of the present invention.
Fig. 2 is the gooseneck distribution schematic diagram on the cooling facility for laminar flow of the present invention.
Fig. 3 is the A-A cutaway view of Fig. 2.
Fig. 4 is a control flow block diagram of the present invention.
Drawing reference numeral:
[1] standpipe [2] standpipe [3] standpipe [4] standpipe
[5] standpipe [6] standpipe [7] standpipe [8] control module
[81] water valve [82] water valve [83] water valve [84] water valve
[11] gooseneck [12] gooseneck [13] gooseneck [14] gooseneck
[15] gooseneck [16] gooseneck [17] gooseneck [18] gooseneck
[19] gooseneck
The specific embodiment
Specifically introduce a kind of preferred embodiment of the present invention below in conjunction with accompanying drawing 1-4.
As shown in Figure 1, on band steel direction of advance, the present invention is installed vertically, equidistant distribution standpipe 1-7, the standpipe 4 of central authorities is controlled by a water valve 81, standpipe 3,5 near central standpipe 4 outsides is controlled by a water valve 82 simultaneously, standpipe 2,6 near standpipe 3,5 outsides is controlled by a water valve 83 simultaneously, and the standpipe 1,7 in close standpipe 2,6 outsides is simultaneously by 84 controls of a water valve.One control module 8 connects each water valve 81-84 respectively, controls each water valve and opens and closes.
Shown in Fig. 2,3, each bar standpipe 1-7 both sides spiral connects some groups of goosenecks, and every group of gooseneck equidistantly distributes, and the outlet of the gooseneck 11-19 in every group is equidistant respectively to be arranged in and with on the perpendicular straight line of steel traffic direction.And the outlet of the preceding half section gooseneck 11-14 of the gooseneck 11-19 in every group is distributed in a side of standpipe 1, and the second half section, gooseneck 16-19 was distributed in the opposite side of standpipe 1.Spacing between the adjacent outlet of each of every group of gooseneck 11-19 equates.
As shown in Figure 4, in process of production, control flow of the present invention may further comprise the steps:
Step 1, beginning: adjust the water valve openings of sizes, and confirm that water valve is in the automatic control state of magnetic valve;
Step 2, obtain the strip width data: directly obtain the strip width data from upper PLC, and confirm from upper PLC;
Step 3, calculating cooling water width: according to band steel kind and specification, calculate required cooling water width, cooling water width B=H-Δ X, wherein, H is the strip width data, and Δ X is a cooling water width adjustment value, this Δ X cooling water width adjustment value be an experience on the occasion of, Δ X determines according to band steel kind and specification, and is optimized by practical application, and promptly the cooling water width B is less than the width value of band steel.
In the present embodiment, strip width B is 1250mm, the Δ X cooling water width adjustment value of certain band steel kind and specification is 250mm, cooling water width B=H-Δ X=1250mm-250mm=1000mm then, be that the cooling water width just is 1000mm, and this cooling water width 1000mm has, and the control corresponding water valve is corresponding to be realized.
Step 4, control module send open command to each water valve: control module sends open command to the magnetic valve of controlling each water valve according to cooling water opens wide result of calculation;
If the band steel is whipping, then be with the cooling of steel laminar flow to finish execution in step seven;
If the band steel is whipping not, then work on until whipping;
Step 7, laminar flow water cooling device quit work: after cooling procedure finishes, and closed electromagnetic valve, each described standpipe stops into water;
For example, by above-mentioned control method, the cooling water control of standpipe 1-7 can be divided into 4 grades of controls and form 4 kinds of cooling width:
First order cooling width: standpipe 4 produces first order cooling width (the narrowest cooling width) by an independent water valve control;
Second level cooling width: standpipe 3,5 is also opened synchronously by an independent water valve control, and opens cooling water formation second level cooling width with standpipe 4;
Third level cooling width: standpipe 2,6 is also opened synchronously by an independent water valve control, and opens cooling water formation third level cooling width with standpipe 4 and standpipe 3,5;
Fourth stage cooling width: standpipe 1,7 is also opened synchronously by an independent water valve control, and with standpipe 4, standpipe 3,5, standpipe 2,6 is opened cooling water together and is constituted fourth stage cooling width.
In addition, if on the basis of above 4 grades of controls, increase the ability of cooling width control segmentation,, just can in original width range, increase more width control area as long as increase corresponding water valve and standpipe quantity.
And, the technology of the present invention is except increasing the ability of cooling width control segmentation on the basis of above 4 grades of controls, can also adopt non-uniform Distribution on the width control range, standpipe adopts non-uniform Distribution, and the distance between the standpipe increases progressively from the centre to both sides successively.With the width control range at laminar flow cooling middle part more greatly, improve the ability of laminar flow cooling limit portion cooling width adjusting control segmentation, the width adjusting control range that is about to laminar flow cooling limit portion is a little bit smaller, make each limit portion width control area progressively less than the zone of centre, thereby strengthen strip edge portion temperature controlling ability.
Obviously, when the strip width of required cooling is within three pairing width of standpipe, will be with steel to place the middle part, control module 8 sends to send out and opens instruction and open water valve 81,82, and at this moment, standpipe 3,4,5 begins to cool down the band steel; Article three, the gooseneck 11-19 on the cooling tube begins water spray, and having formed one is the cooled region of scope with 3,4,5 corresponding width regions of standpipe.At this moment, other cooling tube 1,2,6,7 is not worked, and they do not spray cooling water at The corresponding area, have compared with prior art saved cooling water.
When the strip width of required cooling is within 7 pairing width of standpipe, will be with steel to place the middle part, control module 8 sends to send out and opens instruction and open water valve 81-84, and at this moment, standpipe 1-7 all begins to cool down the band steel; Article seven, the gooseneck 11-19 on the cooling tube begin the water spray, formed one with standpipe 1-7 corresponding width regions be the cooled region of scope.The present invention adapts to the needs of the band steel cooling of different in width fully.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (10)
1. laminar flow water cooling device, comprise some standpipes (1-7), it is characterized in that: the setting of described standpipe (1-7) is consistent with band steel traffic direction, described standpipe (1-7) is symmetrically distributed, standpipe (1-7) water inlet end respectively is provided with a water valve (81-84), and each standpipe (1-7) is provided with some cooling water pipes on one's body.
2. laminar flow water cooling device as claimed in claim 1 is characterized in that: the standpipe that described each group is symmetrically distributed is controlled by same water valve.
3. laminar flow water cooling device as claimed in claim 1 or 2, it is characterized in that: described cooling water pipe is some groups of goosenecks (11-19), gooseneck (11-19) spiral respectively is connected on the standpipe (1-7), and the outlet of gooseneck (11-19) is equidistant respectively to be arranged in and with on the perpendicular straight line of steel traffic direction.
4. laminar flow water cooling device as claimed in claim 3, it is characterized in that: the outlet of preceding half group of gooseneck (11-14) of described every group of gooseneck (11-19) is distributed in a side of standpipe (1), and the outlet of later half group of gooseneck (16-19) is distributed in the opposite side of standpipe (1).
5. laminar flow water cooling device as claimed in claim 4 is characterized in that: the outlet of described every group of gooseneck (11-19) is symmetrically distributed according to the center of every group of gooseneck (11-19).
6. laminar flow water cooling device as claimed in claim 5 is characterized in that also comprising: a control module (8), connect each water valve (81-84) respectively, and send the valve opening and closing signal to each water valve (81-84).
7. as any described laminar flow water cooling device among the claim 4-6, it is characterized in that: described standpipe (1-7) non-uniform Distribution, the distance between the described limit portion standpipe is little than the distance between the standpipe of middle part.
8. as any described laminar flow water cooling device among the claim 4-6, it is characterized in that: described standpipe (1-7) equidistantly distributes.
9. the control method of a laminar flow water cooling device as claimed in claim 7 is characterized in that may further comprise the steps:
Step 1, beginning: adjust described water valve (81-84) openings of sizes, and confirm that water valve (81-84) is in the automatic control state of magnetic valve;
Step 2, obtain the strip width data: directly obtain the strip width data from upper PLC, and confirm from upper PLC;
Step 3, calculating cooling water width:, calculate required cooling water width, cooling water width B=H-Δ X according to band steel kind and specification, wherein, H is the strip width data, and Δ X is a cooling water width adjustment value, this Δ X cooling water width adjustment value be an experience on the occasion of;
Step 4, described control module (8) send open command to each water valve (81-84): described control module (8) sends open command to the magnetic valve of controlling each water valve (81-84) according to cooling water opens wide result of calculation;
Step 5, magnetic valve are controlled described water valve (81-84) according to open command: magnetic valve is controlled the unlatching of corresponding water valve (81-84) or is kept closed condition according to the open command that receives;
Step 6, laminar flow water cooling device quit work: after cooling procedure finishes, and closed electromagnetic valve, each described standpipe (1-7) stops into water;
Step 7, new width or the end laminar flow of data decision adjustment that is provided by upper PLC cool off control procedure.
10. the control method of laminar flow water cooling device as claimed in claim 9 is characterized in that: also comprise step 5-1 between step 5 and step 6: judge whether whipping of band steel:
Cooling facility for laminar flow in the course of the work, to the band steel whether whipping is followed the tracks of, the decision whether stop control:
If the band steel is whipping, then be with the cooling of steel laminar flow to finish execution in step six;
If the band steel is whipping not, then work on until whipping.
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| CN2009100465347A CN101811144B (en) | 2009-02-24 | 2009-02-24 | Laminar flow water cooling device and control method |
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| CN2009100465347A CN101811144B (en) | 2009-02-24 | 2009-02-24 | Laminar flow water cooling device and control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102847631A (en) * | 2011-06-29 | 2013-01-02 | 宝山钢铁股份有限公司 | Nozzle device and method for cleaning surfaces of metal strips |
| CN103878185A (en) * | 2012-12-21 | 2014-06-25 | 宝山钢铁股份有限公司 | Dynamic section cooling control method for hot rolling laminar cooling |
| CN104668296A (en) * | 2014-12-11 | 2015-06-03 | 马钢(集团)控股有限公司 | Condition monitoring method of section-steel through-water cooling high-pressure inverter water pumps |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1500573A (en) * | 2002-11-13 | 2004-06-02 | 鞍钢集团新钢铁有限责任公司 | Method for stream cooling semi finished metal of hotstrip |
| JP3955009B2 (en) * | 2003-10-17 | 2007-08-08 | 新日本製鐵株式会社 | Controlled cooling system for hot steel |
| JP4546897B2 (en) * | 2005-08-16 | 2010-09-22 | 新日本製鐵株式会社 | Hot rolling facility for steel plate and hot rolling method for steel plate |
| CN101253009B (en) * | 2005-08-30 | 2010-12-22 | 杰富意钢铁株式会社 | Cooling facility and cooling method of steel plate |
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2009
- 2009-02-24 CN CN2009100465347A patent/CN101811144B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847631A (en) * | 2011-06-29 | 2013-01-02 | 宝山钢铁股份有限公司 | Nozzle device and method for cleaning surfaces of metal strips |
| CN103878185A (en) * | 2012-12-21 | 2014-06-25 | 宝山钢铁股份有限公司 | Dynamic section cooling control method for hot rolling laminar cooling |
| CN104668296A (en) * | 2014-12-11 | 2015-06-03 | 马钢(集团)控股有限公司 | Condition monitoring method of section-steel through-water cooling high-pressure inverter water pumps |
| CN104668296B (en) * | 2014-12-11 | 2016-09-07 | 马钢(集团)控股有限公司 | A kind of method for monitoring state of shaped steel Water cooling high-pressure frequency-conversion water pump |
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